Frank s



(Modem I F. S. CLARKSON.

CASE FOR LOCKS. No. 244,855. Patented.Ju1y.26,1881.

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WITNESSES, tNVENTOR 14 4 V V BY f/ t-gglj ATTORNEY.

UNITED STATES I PATENT I OFFICE.

FRANK s. cLARKsoN, oF BALTIMORE, MARYLAND, AssIeNoR F ONE-HALF TO FRANK B. sLoAN, 0F SAME FLAcE.

CASE FOR LOG-KS.

SPECIFICATION forming part of Letters Patent No. 244,855, dated July 26, 1881.

' Application filed May 17, 1881. (ModeL) To all whom it may concern:

Be it known that I, FRANK S. OLARKsoN, of Baltimore city, State of Maryland, have invented certain new and useful Improvements in Locks; and I hereby declare the same to be fully, clearly, and exactly described as follows, reference being had to the accompanying drawings, in which,

Figure 1 isja perspectiy'e view of a look embodying my invention, and Fig. 2 is a top plan of the same.

My invention relates to looks for furniture, such as are used on bureau drawers and the doors of wardrobes, wash-stands, &c.; and it has for its object to provide a lock of such shape that it may be insertedin a machinemade mortise of peculiar form, and shall lit in the'mortise in such manner as to dispense with a pair of the usual securing-screws.

1 andto each other.

Locks of the class referred to are so simply and cheaply made that the cost of fitting them in place by the usual method exceeds that of the lock itself, and as the lock cannot be cheap- .ened my invention is directed to lessening the cost of inserting them in the articles of furniture upon which they are used.

In the drawings is represented the standard 72 lock, having its top plate made after my invention.

A is the front plate, and a the top, punched from sheet-iron, as usual, and bent at right angles. In stead of being coextensive with the front, as in the ordinary lock, the top a is pro vided with end ears,c' c, curved at the endsin the arc of a circle and meeting the front plate at a short distance from its ends, the parts (1 d being also curved in the arc of a circle.

B is the plate covering the lock mechanism, having slots 11 for the key. 0 is the bolt, and e 0 holes for the attaching-screws.

To insert the lock in the drawer or door I construct a mortise by means of a machine which will be made the subject of a separate application for patent. It will be sufficient here to state that it embodies a laterally-cutting bit and a carrier for the work having a motion, with reference to the axis of the bit, parallel or coincident with the same, and also two other motions at right angles to the first The bit is adapted to cut a hole accurately of the size of the circle, of

which the ears 0 form a part. The work being clamped on its carrier, the latter is presented to the bit at the proper point for the mortise, and the bit is sunk to the depth of the top plate, a. The work is then moved laterally, whereby the bit cuts out arecess of the depth of the top plate until the axis of the bit has reached a point distant from its point of entrance by the distance separating the centers of the circles of the ears '0. then retracted and again brought up, to the bit, which is made in the same manner to cut out the wood between the centers of the curves d, the depth of out being still equal to the thickness of the plate. Finally, the bit is projected inward to out the recess for the coverplate B, and the mortise is complete.

key-hole is meanwhile out by another bit.

It will be seen from the foregoing that the mortise is accurately of the shape to receive the lock, and a perfect fit is insured. It is made in one -fourth the time it has taken to read the above, and by means of a machine which does not need skilled labor to use it, as all the. motions of the parts are determined by suitable stops. The wood being left between the ears 0 and the inner side of the drawer or door, the upper part of the lock is held in place, and a pair of barbed wire tacks or screws inserted through the holes 6 secures the lock in place.

The economy resulting from the mode of in sorting the lock, and from dispensing with two screws, soon causes the machine to pay for itself and is clear gain, because the only change in the lock is in the shape of the top plate, which may be as readily punched out in the shape shown as in the ordinary shape.

What I claim is- The lock herein described, having its top plate provided with semicircular end tangs adapted to engage with the wood, and obviate the necessity for screws orother fastening devices at the top of the lock, and admit of the lock being inserted in a mortise formed by a laterally cutting bit, as set forth.

FR ANK S. GLARKSON.

Attest J No. T. MADDOX, R. D. WILLI MS.

The work is The 

